0,0 → 1,67 |
/* |
* CRC encoder (for codec/format testing) |
* Copyright (c) 2002 Fabrice Bellard |
* |
* This file is part of FFmpeg. |
* |
* FFmpeg is free software; you can redistribute it and/or |
* modify it under the terms of the GNU Lesser General Public |
* License as published by the Free Software Foundation; either |
* version 2.1 of the License, or (at your option) any later version. |
* |
* FFmpeg is distributed in the hope that it will be useful, |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
* Lesser General Public License for more details. |
* |
* You should have received a copy of the GNU Lesser General Public |
* License along with FFmpeg; if not, write to the Free Software |
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
*/ |
|
#include "libavutil/adler32.h" |
#include "avformat.h" |
|
typedef struct CRCState { |
uint32_t crcval; |
} CRCState; |
|
static int crc_write_header(struct AVFormatContext *s) |
{ |
CRCState *crc = s->priv_data; |
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/* init CRC */ |
crc->crcval = 1; |
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return 0; |
} |
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static int crc_write_packet(struct AVFormatContext *s, AVPacket *pkt) |
{ |
CRCState *crc = s->priv_data; |
crc->crcval = av_adler32_update(crc->crcval, pkt->data, pkt->size); |
return 0; |
} |
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static int crc_write_trailer(struct AVFormatContext *s) |
{ |
CRCState *crc = s->priv_data; |
char buf[64]; |
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snprintf(buf, sizeof(buf), "CRC=0x%08x\n", crc->crcval); |
avio_write(s->pb, buf, strlen(buf)); |
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return 0; |
} |
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AVOutputFormat ff_crc_muxer = { |
.name = "crc", |
.long_name = NULL_IF_CONFIG_SMALL("CRC testing"), |
.priv_data_size = sizeof(CRCState), |
.audio_codec = AV_CODEC_ID_PCM_S16LE, |
.video_codec = AV_CODEC_ID_RAWVIDEO, |
.write_header = crc_write_header, |
.write_packet = crc_write_packet, |
.write_trailer = crc_write_trailer, |
.flags = AVFMT_NOTIMESTAMPS, |
}; |